Unico upc-18-085s-4 90-degree Elbow Fiberglass R-4.2 Duct

Product Description

The UNICO upc-18-085s-4 is a 90-degree elbow duct fitting designed for high-velocity air distribution systems. Built from fiberglass with an R-4.2 insulation rating, this elbow provides a smooth directional change in round duct runs while maintaining thermal performance throughout the supply-air path. Each box contains four elbows, making it practical for multi-zone installations or jobs that require several turns. It is sized at 8.5 inches by 8.5 inches to match standard UNICO small-duct, high-velocity system components. HVAC technicians and mechanical contractors install these fittings during new construction or retrofit projects where space-saving duct routing is required.

This elbow fitting is intended for use in small-duct, high-velocity HVAC systems where round fiberglass ductwork is run through tight framing cavities, floor joists, or wall chases. It is a standard component in residential and light-commercial installations using high-velocity supply systems. The R-4.2 insulation value helps control condensation and heat loss along the supply-air duct run, which is especially important in unconditioned spaces such as attics, crawlspaces, and interior wall cavities.

Key Features

• 90-degree elbow configuration for directional changes in duct runs
• Fiberglass construction provides durability and integrated insulation
• R-4.2 insulation rating limits heat gain and condensation risk
• 8.5 inches by 8.5 inches sizing for standard high-velocity round duct systems
• Sold in boxes of four for multi-fitting installations

Compatibility

Designed as an OEM-style fitting for small-duct, high-velocity round fiberglass duct systems requiring 90-degree directional changes at the 8.5-inch nominal size.

Installation Notes

Installation should be performed by a licensed HVAC technician familiar with high-velocity duct system requirements. Shut down the air handling unit and verify the system is de-energized before modifying any duct sections. Seal all joints with compatible duct mastic or approved tape per local mechanical code requirements to maintain system pressure and insulation integrity. Handle fiberglass duct components with gloves and appropriate respiratory protection per safety guidelines.

Technical Specifications

• Fitting Type: 90-Degree Elbow
• Dimensions: 8.5 inches x 8.5 inches
• Material: Fiberglass
• Insulation Rating: R-4.2
• Quantity Per Box: 4

Standard Information

• Brand: UNICO
• Manufacturer Part Number: upc-18-085s-4